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- 저자 : 오세헌 ( Se Hun Oh ) (검색결과 4 건)
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연료분무 및 연소 1 : 수첨처리 바이오디젤 성상에 따른 연료 분무특성 비교
오세헌 ( Se Hun Oh ),김덕한 ( Duck Han Kim ),김성환 ( Seong Hwan Kim ),노수영 ( Soo Young No ) 한국액체미립화학회 2013 한국액체미립화학회 학술강연회 논문집 Vol.2013 No.-
Hydrotreated biodiesel (HBD) would be one of the promising alternative fuels instead of current biodiesel. In this study, Investigation of spray characteristics in terms of spray penetration and spray angle were conducted experimentally including calculated SMDs as well. The ambient pressures of 1, 3, and 5 MPa and injection pressures of 30, 80, and 130 MPa were introduced and the fuels employed were petro-diesel, and 2, 10, 20, 30, and 50 % for hydrotreated biodiesel, respectively. 6 holes of Bosch injector was used for this study with 156 degree of injection angle and 0.120 mm of nozzle diameter. In this study, spray tip penetrations were measured and analyzed between 0.0 ms and 3.0 ms after start of injection. Pictures were taken at every 0.1 ms of time frames. It was difficult to measure spray angles because of low resolution. Thus, spray angles were measured after 0.2 ms of injection. Test result shows that the distinct differences in penetration length among fuels were shown regardless of ambient pressure in the low injection pressure like 30 MPa. At the same injection pressure such as 130 MPa, the spray penetration length at ambient pressure of 1Mpa shows three times higher than that of 5Mpa. Spray tip penetrations were mostly affected by the injection pressure and ambient pressure. Thus, there were little significant differences of spray tip penetrations among test fuels at the same conditions. Nevertheless, the more HBD blended diesel shows relatively shorter penetration length because of lower density than that of petro-diesel. On the contrary, the more biodiesel blended fuel shows the longer penetration length because of higher density than that of petro-diesel. Relatively larger spray angles were observed to the more HBD blended diesel than petro-diesel at the same time frame after injection. The more biodiesel blended diesel shows smaller spray angle as opposed to HBD, because of the difference of their density, kinetic viscosity and surface tension. Spray angle increases appreciably with increase in nozzle diameter, and diminishes with increase in ambient density, liquid viscosity, and injection pressure of liquid. Spray angle decreases with increase in viscosity. Surface tension had no appreciable effect on spray angle. Spray angle widens slightly with increase in density. SMD correlations among surface tensions, densities and viscosities of petro-diesel and HBD blended diesels were calculated by means of two typical numerical equations, which is the regression model developed from the experimental data acquired using Malvern Particle Size Analyzer. The results on SMD can be seen that viscosity has more positive effects than density. Therefore, the more HBD blended fuels were shown the slightly larger SMDs than petro-diesel, because of larger viscosity of HBD than that of petro-diesel. Consequently, this study has found that HBD has a little bit merits and demerits of macro- and microspray patterns compared to petro-diesel.
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장애인 취업의사에 영향을 미치는 요인으로서 가족의 긍정적 의사표현, 사회적 관계망 그리고 장애정체감의 역할
김재엽 ( Jae Yop Kim ),이진석 ( Jeen Suk Lee ),오세헌 ( Se Hun Oh ) 한국사회복지연구회 2014 사회복지연구 Vol.45 No.2
본 연구는 장애인들의 취업의사에 영향을 미치는 주요 요인으로서 가족의 긍정적 의사표현, 사회적 관계망, 그리고 장애정체감의 경로를 분석하는 데에 목적이 있다. 이를 위해 2010년 전국가정폭력 실태조사 자료 중 장애인관련 시설을 이용하는 성인장애인 453명을 대상으로 수집된 자료를 바탕으로 구조방정식 모형을 사용하여 주요 변수들의 인과관계를 검증하였다. 연구결과에 의하면, 가족원의 장애인에 대해 긍정적 의사표현의 빈도가 높을수록 장애인의 장애정체감과 취업의사가 증가되었다. 또한 사회적 관계의 빈도가 높을수록 장애인의 장애정체감이 상승되었으나 취업의사에는 직접적으로 영향을 미치지 않는 것으로 나타났다. 마지막으로 장애정체감은 취업의사를 결정하는 주요 요인으로서 파악되었다. 이상의 연구결과를 바탕으로 장애인의 낮은 취업의사로 인한 사회통합의 문제를 완화하고 예방하기 위한 개입 방안을 제언하였다. The purpose of this study is to analyze the cause-and-effect relationships among positive verbal expressions from family members, social network, and disability identity as the determinant factors of intention to work. To achieve the goal, 453 persons with disabilities and with experiences of using facilities for the disabled were studied, who were recruited for the national survey of domestic violence in 2010. For the research subjects, the cause-and-effect relationships among the major factors were examined by using a structural equation model. According to the results, disability identity and intent to work tended to be higher as they had experienced more of positive verbal expressions from their families. Moreover, a more participation in social activities increased disability identity, but not intent to work. Lastly, disability identity was found to be a determinant of intent to work. Based on the results, we provide suggestions to achieve social inclusion of people with disabilities by raising the intent to work.
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